Everything you wanted to know about wideband, low-frequency
transformers:
PDF
contains multiple circuits - scroll to find this circuit.
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External Isolation Transformer Box: designed for Mackie and
other Mixers Eliminates RFI Problems |
Grounding & Shielding: describes basic audio transformer
uses like balanced in/out and signal splitters
|
High CMRR Balanced Interface: Uses for Crystal18 or20 Bit
A/D Converters. This is a PDF file |
High Output Line Driver for Single Ended Power Supply: PDF
file |
IC Mic Preamp uses Jensen Twin Servo topology:
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Interconnection of Balanced & Unbalanced Equipment: 4 page
booklet in PDF format |
Internal Modification to Mic Inputs of the Mackie 1604 Mixer
Eliminates RFI Problems: adding transformer isolation
increases common mode rejection and eliminates RF interference,
PDF document |
Isolation Transformer Passes millihertz Signals: 08/04/94
EDN-Design Ideas |
IT 4 Four Channel Isolation Transformer unit: audio signal
isolation transformer, product datasheet with circuit diagram in
PDF format |
IT one inline 600 / 600 Ohm Line Transformer: audio signal
isolation transformer, product datasheet with circuit diagram in
PDF format |
Jensen Direct Box Transformers: data sheets have example
circuit diagrams |
Jensen Transformers Application Schematics: includes many
microphone preamplifier related |
JP 11P 1 Input Transformer Improvement for Electronically
balanced Input: |
JS 11SPP 6M 600 Ohm Line Isolator with Line termination Switch:
for used with long 600 ohm lines that need termination |
JS 11SSP 6M 150 Ohm Line to 600 Ohm Load application:
isolation transformer with impedance conversion
|
JT 10B D Used in Line Level 2 Way Splitter / Isolator:
active line level splitter circuit with input and output
isolation |
JT 10KB D & JT 6110K B "Pro" to "Consumer" Interfaces: from
+4dBu balanced output to -10dbV consumer equipment input |
JT 10KB D & JT DB E Provide "J Box" Consumer to Studio
Interfaces: from -10dBV unbalanced to150 ohm balanced
microphone level -45dBu signal and from +4dBu balanced signal to
-10dBV unbalanced signal |
JT 10KB D Isolates & Converts Speaker Drive to Line Level:
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JT 11 BM High Level Differential IC Output Stage with DC Servo:
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JT 11 BM High Level High Current Differential Output Stage with
DC Servo: |
JT 11 DM Basic Hum Stopper Transformer Isolation Box: simple
isolator for 600 ohm balanced audio lines |
JT 11 DM Converts Unbalanced Output to Balanced:
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JT 11 FL Isolates & Converts Guitar Amp Speaker Out to Line
Output: |
JT 11 FL provides Isolated Line Output from Guitar Amplifier:
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JT 11 YZPC in Unbalanced Long Line Driver / Isolator:
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JT 11B 1 + "Phantom" Buffer Provide Balanced Guitar Output:
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JT 11P 1 as "Phase Splitter" with Symmetrical Outputs:
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JT 11P 1 Balanced Tube Line Input Stage:
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JT 11P 1 Conversion of Unbalanced Input to Balanced:
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JT 11P 1 in 2 Way Passive "Guitar Splitter": from one guitar
to2- guitar amplifiers |
JT 11P 1 in 4 Way Active "Guitar Splitter": from one guitar
to up to4 guitar amplifiers |
JT 11P 1 Unbalanced Automotive or Consumer Application:
isolation transformer box for unbalanced consumer audio line
signals |
JT 11P 1 used as Unbalanced Polarity Inverter: passive
transformer based audio signal inverter circuit |
JT 11SSP 6M 600 Ohm Line Isolation Application: isolation
transformer for 600 ohm balanced audio line
|
JT 11SSP 6M as Input Transformer for Crystal CS5367 A / D
Converter: transformer balanced passive input circuit for
CS5367 A/D converter, PDF file |
JT 11SSP 6M Bi-Directional Lo Z Long Line Application: this
circuit isolated and impedance matches less than100 ohm source
to long cable line and that to over10 kohm input |
JT 11SSP 6M Passive Stereo Matrix for M S Mic Technique: |
JT 11SSP 6M Universal Patchbay Isolation Application: for
use with professional low impedance sources and high impedance
loads |
JT 123 BL High Level Low Impedance Differential Output Stage
with DC Servo: |
JT 123 S Line Driver with Feedback Around the Transformer:
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JT 13K6 C in Simple 1 IC Stage Mic Preamp: 15KB PDF |
JT 16 A Improves Performance of SSM2017 Mic Preamp IC:
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JT 6110K B at Input Stage for Crystal a to D Converters:
high performance transformer balanced input stage for Crystal
A/D converters, PDF file |
JT 6110K B Isolates "70 Volt" Line & Converts to Line Level: |
JT DB E "Direct Box" for very High Level Signals: takes high
level line signal and outputs balanced microphone level signal |
JT DB E Converts Consumer Stereo Inputs to Mono Balanced Mic
Output: |
JT DB E Full featured "Direct Box" Application Schematic: |
JT DB E Standard Musical instrument or Synthesizer "Direct Box":
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JT MB C "Real" Mic Inputs & Phantom Power for Sony DAT:
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JT MB C in Low Noise, High Isolation Line Receiver for Low Z
Sources: |
JT MB C Isolates both Mic & Line Inputs of inexpensive Mixer: |
JT MB C Mic Input Isolation for Mackie Mixers: |
JT MB C Used to "Phantom" Power the Realistic PZM Mic: |
JT MB D Converts 600 Ohm Unbalanced Mic to 150 Ohm Balanced Mic
Line: |
JT MB D Passive Stereo Matrix for M S Mic Technique: |
Method sets voltage in multiple-output converters: 02/01/01
EDN-Design Ideas / PDF contains multiple circuits - scroll to
find this circuit. |
Mixed Feedback Drive for Audio Output Transformers:
Technical paper from Lundahl Transformers in PDF format |
Power Supplies & Transformers: Basic structures of power
supplies |
Power Supplies and Regulators: new low power discrete
switcher |
Step Down Rectifier makes a Simple DC Power Supply: 04/09/98
EDN-Design Ideas / A simple and useful nonisolated
rectifier features voltage step-down operation, acceptable Class
A line-current harmonics, inherent short-circuit protection,
and, optionally, a regulated output
|
Theory & Construction of Mic "Splitters": 5 page booklet in
PDF format |
Transformer Coupled Splitter: Active amplified transformer
isolated signal splitter that enables hum-free connection
of1-guitar to more than1-amp as well as having a direct output |
Transformers for Audio Interfacing: Discussion on using
audio transformers in equipment interconnections, read also
Line-level transformers in High-End Audio |